<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function createIncrementor(sum) {
        let i = sum
        function fn() {
          i++
          return i
        }
        return fn
      }

      const incrementor = createIncrementor(10)
      console.log(incrementor()) // 11
      console.log(incrementor()) // 12
      console.log(incrementor()) // 13
    </script>
  </body>
</html>
